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