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