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