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