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