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