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