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