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