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