What is the diameter of the Cayley graph of $S_n$ w.r.t the generator $\{(12),(23),...,(n−1n)\}$?

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Given a symmetric group $S_n $ and the generator set : $S = \{(12),(23), . . . ,(n − 1 n) \}$ is there any closed form expression for the diameter of the Cayley graph generated by this set of generator ? Is there any upper bound on that diameter ?

For the given generator set: $diameter(S_2) = 1$, $diameter(S_3) = 3$, $diameter(S_4) = 6$ so does the following hold ?

$diameter(S_n) = nC_2$ [w.r.t the given generator set]

It will be great to have the tightest bound on the diameter w.r.t the given generator set.