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