Red (all day) or Violet (at Rogation procession and Mass only)
The Greater Litanies (excerpted from Rubricae generales):
81. Of the greater litanies there is nothing in the office, but only in the Mass. […]
82. According to conditions and customs varying from one church to another and from one place to another … a procession is held on this day, in which the Litany of Saints is said with its accompanying prayers. The petitions of the litany are not doubled.
83. If a procession cannot be held, … special supplications [may be said], which shall include the Litany of the Saints and the other prayers customarily said in procession.
84. All those who are bound to the recitation of the divine office, but do not take part in the procession or in the other special supplications mentioned in the preceding section, must say the Litany of the Saints with its prayers, in Latin, on this day.
85. If, according to the custom of the place, the Litany of the Saints with its prayers is said in the vernacular tongue along with the faithful, in procession or as a part of the other special supplications, those who are bound to the recitation of the divine office and who actually take part in these supplications do not have to repeat these prayers in Latin.
86. The rogation Mass is regularly to be said after the procession…. It is fitting, however, that the rogation Mass be said even after the special supplications which take the place of the procession, even if these services are held in the evening. [It is a II class votive Mass, per RG 346.]
Apart from procession/supplications: Mass of St. Mark (Red), Gloria*, commemoration of the Rogations, Credo*, preface of the Apostles
Following procession/supplications: Mass of the Rogations Exaudivit de templo, listed in the Missal before the Vigil of the Ascension (Violet), prayers at the foot of the altar omitted, no Gloria*, commemoration of St. Mark, no Credo*, preface of Easter
*The Gloria and Credo are said in the Mass of St. Mark because it is the festal Mass (Gloria) of an Evangelist (Credo). They are not said in the Rogations Mass because it is a II class votive (no Credo) with violet vestments (no Gloria)
Semifestal office of St. Mark; the Greater Litanies are not commemorated in the Divine Office.
Matins: Invitatorium and Hymn from the Common of Apostles, one Easter antiphon for each nocturn, with proper psalms, lessons of Nocturn I and III are from the Common of Evangelists, those of Nocturn II are proper, Te Deum
Lauds: Easter antiphons from the Common of Apostles, with psalms of Sunday (first schema), remainder from the same Common, oration proper
Hours: Antiphon Alleluia and psalms of the feria; remainder from the Common of Apostles
Vespers: All is proper from the Common of Apostles, except the oration which is proper for the feast; commemoration of I Vespers of the coming Sunday
Compline: Of Sunday