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