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