Diogenes thought writing and teaching of philosophy were pretentious, and so left no written works. The closest you're going to get is this chapter of "the Lives and Opinions of Eminent Philosophers" by a different ancient philosopher named Diogenes, which covers the Cynical school of philosophy, including Diogenes of Sinope. Only 2 hours but by a kind of obnoxious foreign reader. https://www.youtube.com/watch?v=iwZ6KhOcpe4
Aristotle, however, has most of his corpus available on youtube in audiobook format, and can be found by typing "aristotle audiobook" into the search bar on Youtube. Please be aware also that Diogenes of Sinope and Aristotle have almost perfectly opposite philosophies: Aristotle though the pursuit of knowledge was noble and the political life both natural and noble, while Diogenes thought politics and metaphysics were unnatural and mere pretension.
Here is his Nichomachean Ethics in audiobook. It's a must read, but be forewarned that the reader for this book is insanely boring and kind of annoying. It may be worth looking for other readers. It is ten hours in a single recording. https://www.youtube.com/watchv=GQhZNy9nkDg&t=3s
Here is his Politics. It's a mere 8 hours in a single recording, and so pretty easy to complete. Be aware though that Aristotle believes politics to be only an extension of ethics, and so this book is intended as a sort of part two to his Nichomachean Ethics. https://www.youtube.com/watch?v=d3gVry2xoOE
Here's his Rhetoric. I've actually never read this work, and it's by the same boring reader as the Ethics. https://www.youtube.com/watch?v=Nt6Ai0FNN70Post too long. Click here to view the full text.