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