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