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