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