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