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