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)(27,33)(28,34)(30,36)(32,37)(35,39)(38,40)(1,2,4,5)(3,6,7,8)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(25,26,29,31)(27,30,35,38)(28,32,34,37)(33,36,39,40)(2,5)(6,8)(12,21)(15,20)(18,24)(22,23)(25,27,34,39,29,35,28,33)(26,30,37,40,31,38,32,36)(1,3,4,7)(2,6,5,8)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(25,26)(27,30)(28,32)(29,31)(33,36)(34,37)(35,38)(39,40)(11,19)(14,17)(18,24)(22,23)(26,31)(30,38)(32,37)(36,40) 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.