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