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