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