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