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