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