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