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