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