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