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