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)(11,14)(12,15)(13,16)(17,21)(18,22)(19,23)(20,24)(27,35)(28,29)(31,39)(32,34)(36,40)(37,38) involution — undirected(2,5)(6,8)(9,11,13,18)(10,14,16,22)(12,19,20,17)(15,23,24,21)(25,26,30,33)(27,36,37,31)(28,32,29,34)(35,40,38,39)(9,12,13,20)(10,15,16,24)(11,17,18,19)(14,21,22,23)(25,27,30,37)(26,31,33,36)(28,35,29,38)(32,39,34,40)(10,16)(14,22)(15,24)(21,23)(25,28,30,29)(26,32,33,34)(27,35,37,38)(31,39,36,40)(1,3,4,7)(2,6,5,8)(26,33)(31,36)(32,34)(39,40)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.