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