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