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