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