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