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