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