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