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