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