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