One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,13)(4,9)(5,10)(6,11)(7,12)(8,15)(14,27)(16,22)(17,24)(18,25)(19,26)(20,23)(21,29)(28,31)(30,32)(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)(4,14)(5,15)(6,20)(7,16)(9,21)(10,22)(11,13)(12,23)(17,28)(18,29)(19,30)(24,27)(25,32)(26,31)(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(1,4,7,19)(2,9,12,26)(3,14,16,30)(5,18,6,17)(8,21,23,31)(10,25,11,24)(13,27,22,32)(15,29,20,28)(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)(2,10,12,11)(3,15,16,20)(4,17,19,18)(8,22,23,13)(9,24,26,25)(14,28,30,29)(21,27,31,32)(35,44)(39,50)(43,55)(45,57)(49,59)(51,61)(56,63)(60,64)(1,5,7,6)(2,11,12,10)(3,15,16,20)(4,18,19,17)(8,13,23,22)(9,24,26,25)(14,29,30,28)(21,27,31,32)(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.