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