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