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