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