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