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