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