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