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