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