Was looking for something like that for a while, and saw today these 2 nice tools that help create and visualize cloud architectures:
1. cloudcraft.co – more mature and nicer, but AWS only
2. cloudmaker.ai – new, more issues, pros: has unlimited grid on free tier and support for all 3 – Azure, AWS, GCP, but seems to be most heavy on Azure
In any case, both are good stuff 😉