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