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