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