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