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