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