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