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