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