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