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