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)(11,13,18,15)(12,20,22,16)(19,21,24,23)(25,26)(27,33)(28,36)(29,32)(30,35)(31,38)(34,39)(37,40)(1,3,5,4)(2,6,8,7)(9,11,14,18)(10,15,17,13)(12,19,22,24)(16,21,20,23)(25,27,29,35)(26,30,32,33)(28,37,38,34)(31,40,36,39)(1,3,5,4)(2,7,8,6)(9,12,14,22)(10,16,17,20)(11,19,18,24)(13,23,15,21)(25,28,29,38)(26,31,32,36)(27,34,35,37)(30,39,33,40)(10,17)(11,18)(16,20)(19,24)(26,32)(30,33)(31,36)(39,40) involution — undirected(1,3,5,4)(2,7,8,6)(9,13,14,15)(10,18,17,11)(12,21,22,23)(16,19,20,24)(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.