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