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