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