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