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