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