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