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