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