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