One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,14,8,12,6,13)(3,15,18,39,19,9,29,33)(4,20,23,36,24,40,30,10)(5,25,27,37,28,11,26,38)(16,34,21,41,45,57,44,31)(17,32,46,58,47,42,54,60)(22,50,51,35,52,48,55,53)(43,62,49,56,64,59,63,61)(1,3,6,18,8,19,7,29)(2,9,13,33,12,15,14,39)(4,21,23,16,24,44,30,45)(5,17,26,46,28,47,27,54)(10,34,20,31,36,57,40,41)(11,32,37,58,25,42,38,60)(22,49,51,43,52,63,55,64)(35,59,48,56,53,62,50,61)(1,4,6,23,8,24,7,30)(2,10,14,40,12,36,13,20)(3,16,18,44,19,45,29,21)(5,22,26,51,28,52,27,55)(9,31,39,34,15,41,33,57)(11,35,38,50,25,53,37,48)(17,43,46,63,47,64,54,49)(32,56,60,59,42,61,58,62)(1,5)(2,11,12,25)(3,17)(4,22)(6,26)(7,27)(8,28)(9,32,15,42)(10,35,36,53)(13,37,14,38)(16,43)(18,46)(19,47)(20,48,40,50)(21,49)(23,51)(24,52)(29,54)(30,55)(31,56,41,61)(33,58,39,60)(34,59,57,62)(44,63)(45,64)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.