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