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