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