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