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