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