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