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