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