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