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