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