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