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