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