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