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