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