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