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