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