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