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