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