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