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