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