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