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