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