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