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