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