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