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