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