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