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