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