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