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