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)(13,27)(15,22)(16,24)(17,25)(18,26)(20,23)(21,29)(28,32)(30,31)(33,34,37,42,38,41,48,54)(35,39,45,51,44,50,57,61)(36,40,46,53,47,52,58,62)(43,49,56,60,55,59,63,64)(1,3)(2,8)(4,13)(5,14)(6,20)(7,15)(9,21)(10,22)(11,23)(12,19)(16,28)(17,29)(18,30)(24,27)(25,31)(26,32)(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)(5,17)(6,16)(7,18)(8,21)(10,25)(11,26)(12,27)(14,29)(15,30)(19,24)(20,28)(22,31)(23,32)(33,36,37,46,38,47,48,58)(34,40,42,53,41,52,54,62)(35,43,45,56,44,55,57,63)(39,49,51,60,50,59,61,64)(1,5,7,6)(2,10,11,19)(3,14,15,20)(4,16,18,17)(8,22,23,12)(9,24,26,25)(13,28,30,29)(21,27,32,31)(35,44)(39,50)(43,55)(45,57)(49,59)(51,61)(56,63)(60,64)(1,5,7,6)(2,10,11,19)(3,14,15,20)(4,17,18,16)(8,22,23,12)(9,25,26,24)(13,29,30,28)(21,31,32,27)(34,41)(39,50)(40,52)(42,54)(49,59)(51,61)(53,62)(60,64)A 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.