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