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