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