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