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