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