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