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