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