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