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