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