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