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