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