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