One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,9)(3,11,14,21)(4,8,17,23)(5,18,19,10)(7,13,22,15)(12,25,27,31)(16,29,30,24)(20,26,32,28)(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)(1,3,6,14)(2,7,9,22)(4,12,17,27)(5,13,19,15)(8,20,23,32)(10,21,18,11)(16,26,30,28)(24,31,29,25)(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)(1,4,6,17)(2,8,9,23)(3,12,14,27)(5,16,19,30)(7,20,22,32)(10,24,18,29)(11,25,21,31)(13,26,15,28)(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)(3,13)(5,19)(7,21)(10,18)(11,22)(12,26)(14,15)(16,30)(20,31)(24,29)(25,32)(27,28) involution — undirected(2,9)(3,14)(8,23)(10,18)(12,27)(13,15)(24,29)(26,28)(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.