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