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