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