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