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)(12,13)(14,16)(17,18,22,26)(19,23,30,40)(20,31,33,24)(21,25,35,43)(27,37,29,39)(28,45,46,38)(32,48,47,41)(34,44,36,42)(10,13)(11,16)(17,19)(18,23)(20,32)(21,27)(22,30)(24,41)(25,37)(26,40)(28,34)(29,35)(31,48)(33,47)(36,46)(38,42)(39,43)(44,45) involution — undirected(2,5)(6,8)(9,11,12,16)(10,14,13,15)(19,27)(21,35)(23,37)(25,43)(28,32)(29,30)(34,36)(38,41)(39,40)(42,44)(45,48)(46,47)(1,3,4,7)(2,6,5,8)(10,13)(14,15)(20,33)(24,31)(28,46)(32,47)(34,36)(38,45)(41,48)(42,44)(17,20,22,33)(18,24,26,31)(19,28,30,46)(21,36,35,34)(23,38,40,45)(25,44,43,42)(27,32,29,47)(37,41,39,48)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.