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The 'Thanks log' shows a list of thanks given by user to other users for particular edits; however, the edit diff one is actually being thanked for is not recorded in the log.

Here is an illustration, the log of thanks sent to my account on English Wikipedia: 

https://en.wikipedia.org/w/index.php?title=Special%3ALog&type=thanks&user=&page=Pharos&year=&month=-1&tagfilter=&hide_patrol_log=1&hide_review_log=1&hide_thanks_log=1

The decision to not publicly show which specific diff it is, was made purposefully. See a brief explanation at https://en.wikipedia.org/wiki/Wikipedia_talk:Notifications/Thanks#Public_counters_and_displays and much more in the comments of bug 49087. HTH :)

*** This bug has been marked as a duplicate of bug 49087 ***