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