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