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