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