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