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