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