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