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