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