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