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