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