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