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