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