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