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