The parade colors of the Guards are a mix of white and purple paneling, with black accents.
Per FM:Free Worlds League, page 45.
Hermes II, FM: Free Worlds League (plate 6)
Thunderbolt, Camo Specs (p 28)
The insignia of the Free Worlds Guards is a yellow, red and black shield held aloft by silver wings. All Guards units carry this marking, on the right leg of ‘Mechs, the tail plane of aerospace craft or the forward glacis of vehicles. The insignia of the Second Guards is a cluster of planets connected with golden chains Per FM: Free Worlds League, pages 43 and 45.