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