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