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