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)(11,14)(12,15)(13,16)(17,19)(18,22)(20,21)(23,24)(25,26)(27,28)(29,33)(30,38)(31,32)(34,39)(35,40)(36,37) involution — undirected(2,5)(6,7)(9,10,13,16)(11,17,19,14)(12,15,21,20)(18,23,24,22)(26,32)(28,33)(34,38)(36,40)(1,2)(3,6)(4,5)(7,8)(25,27,31,29)(26,33,32,28)(30,35,39,37)(34,40,38,36)(1,3)(2,6)(4,8)(5,7)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(25,28,31,33)(26,27,32,29)(30,36,39,40)(34,35,38,37)(9,10)(11,14)(12,20)(13,16)(15,21)(17,19)(18,23)(22,24)(25,29,31,27)(26,33,32,28)(30,35,39,37)(34,36,38,40)(9,12)(10,15)(11,18)(13,21)(14,22)(16,20)(17,23)(19,24)(25,30)(26,34)(27,35)(28,36)(29,37)(31,39)(32,38)(33,40) 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.