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