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