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