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