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