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