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