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