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