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