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