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