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