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