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