Use the set_object_terms hook,
http://adambrown.info/p/wp_hooks/hook/set_object_terms?version=3.4&file=wp-includes/taxonomy.php
It should be fired when a post or page is modified.
Here is the code that fires it:
do_action('set_object_terms', $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids);
You can thus check against the $object_id and taxonomy, and flush your transient cache and regenerate as needed.
Specifically, clear the term caches of the term IDs in $tt_ids and $old_tt_ids
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