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)(19,27,30,39)(20,32,34,24)(21,36,37,25)(23,29,40,31)(28,44,33,43)(35,42,45,48)(38,46,41,47)(2,5)(3,7)(10,13)(11,15)(17,19,21,31,22,30,37,29)(18,23,25,27,26,40,36,39)(20,33,35,47,34,28,45,46)(24,41,42,44,32,38,48,43)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,20,22,34)(18,24,26,32)(19,28,30,33)(21,35,37,45)(23,38,40,41)(25,42,36,48)(27,43,39,44)(29,47,31,46)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(19,29)(20,34)(21,37)(23,39)(24,32)(25,36)(27,40)(28,46)(30,31)(33,47)(38,43)(41,44)(9,11,12,15)(10,14,13,16)(19,30)(20,34)(23,40)(24,32)(27,39)(29,31)(35,45)(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.