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