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