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