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