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