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