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