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