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