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