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