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