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