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