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