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