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