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