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