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