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