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