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