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