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