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