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