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