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