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