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