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