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