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