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