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