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