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