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