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