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