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)(33,34,38,43,37,42,52,40)(35,44,47,56,45,39,53,54)(36,48,51,57,50,41,58,60)(46,55,61,63,49,59,62,64)(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)(34,39)(36,49)(37,45)(38,47)(40,56)(41,59)(42,44)(43,54)(46,50)(48,55)(51,62)(52,53)(57,63)(58,61)(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)(34,40)(35,45)(38,52)(39,54)(41,57)(42,43)(44,56)(46,49)(48,60)(51,58)(55,63)(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)(34,41)(35,46)(37,50)(38,51)(39,55)(40,57)(42,48)(43,60)(44,59)(45,49)(47,61)(52,58)(53,62)(54,63)(56,64)(1,6,7,5)(2,9,10,4)(3,13,14,15)(8,12,11,16)(18,24)(22,26)(23,32)(30,31)(34,42)(36,50)(39,44)(40,43)(46,49)(51,58)(54,56)(61,62)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.