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