One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,14,29,11,32,43,8,13,28,46,5,15,6,12)(3,16,20,35,57,36,19,50,21,38,58,44,18,9,30,37)(4,22,25,10,23,42,33,48,27,47,31,41,26,45,24,40)(17,51,54,62,52,59,53,39,56,64,61,49,55,63,60,34)(1,3,5,18,8,21,29,57)(2,9,11,16,13,36,15,38)(4,17,23,52,27,56,26,55)(6,30,28,58,32,19,7,20)(10,39,40,62,41,34,48,49)(12,44,14,37,43,35,46,50)(22,59,45,51,47,63,42,64)(24,60,25,54,33,53,31,61)(1,4,5,23,8,27,29,26)(2,10,11,40,13,41,15,48)(3,17,18,52,21,56,57,55)(6,31,28,24,32,25,7,33)(9,34,16,49,36,39,38,62)(12,45,14,47,43,42,46,22)(19,54,20,53,30,61,58,60)(35,51,50,63,44,64,37,59)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.