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