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