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