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