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