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