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