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