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