To get to the most recent Facebook post of the article, click at the top of the story card: either on the publisher's logo or on the time stamp of the article. It will open the Facebook post in a new tab. 

If you want to see all the public Facebook posts with this article, you'll need to click on the image of the story card to open the info panel on the right-hand side. You'll see a list of Facebook posts with a time stamp telling when they were created and a breakdown of reactions, comments, and shares each one has received.
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Clicking on the logo or the time stamp of the post will take you to that post on Facebook.