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