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