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