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