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