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