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