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