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