Someone asked this exact question and that's when I realised that there aren’t many audiobooks out there on Service Design at the moment. I should make one of my books in audio format, then!
But in the meantime, here is one audiobook on service design:
The Service Startup: Design Gets Lean by Tenny Pinheiro.
The audiobook is available on Amazon and Apple Books
Design Audiobooks
And here are two other books that aren’t “pure” Service Design but really can help:
Most books from the Design Better series by Invision are also available in audiobook
Also, a quick Google search shows these listings of audiobooks on Design that might interest you: