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