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