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