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