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