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