Presentations of Cluster Modular Groups and Generation by Cluster Dehn Twists

We give a method to compute presentations of saturated cluster modular groups. Using this, we obtain finite presentations of the saturated cluster modular groups of finite mutation type $X_6$ and $X_7$. We verify that the cluster modular groups of finite mutation type ${\tilde{E}}_6$, ${\tilde{E}}_7$, ${\tilde{E}}_8$, $G_2^{(\ast ,\ast )}$, $X_6$ and $X_7$ are virtually generated by cluster Dehn twists.