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