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