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