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)(11,12)(13,21)(14,16)(15,19)(17,22)(18,23)(20,24)(27,33)(31,38)(34,36)(39,40)(2,6)(3,7)(9,11)(10,15)(12,16)(13,18)(14,19)(17,23)(20,21)(22,24)(25,26)(27,31)(28,35)(29,30)(32,37)(33,38)(34,40)(36,39) involution — undirected(1,3)(2,4)(5,7)(6,8)(10,16)(12,15)(13,22)(18,24)(26,30)(27,33)(32,35)(34,36) involution — undirected(1,4)(2,3)(5,8)(6,7)(9,12,14,15)(10,11,16,19)(13,20,22,23)(17,18,21,24)(25,27,29,33)(26,31,30,38)(28,36,37,34)(32,40,35,39)(9,11)(10,12)(13,18)(14,19)(15,16)(17,20)(21,23)(22,24)(25,28)(26,32)(27,34)(29,37)(30,35)(31,39)(33,36)(38,40) involution — undirected(9,13,14,22)(10,17,16,21)(11,18,19,24)(12,20,15,23)(25,26)(27,31)(28,32)(29,30)(33,38)(34,39)(35,37)(36,40)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.