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