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