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