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