Google play services handles access to the play store, api updates used by developers and Google, communication between various apps and Google maps, YouTube, search, Gmail, etc,and can add feature updates without updating Android. You can clear the cache by going to...
Settings--Application Manager--Select Google play services (under "all" or "dowmloaded" ---Manage space..
You can also get there through "Storage"
btw my phone shows 104 MB (~33MB for the app), so your usage is not out of the norm.