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