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