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