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