The architecture is an important security control, good architectures reduce attack vectors and impact in case of a breach.
Review the Well Architected Framework documents to enhance your capacity for secure architectural design.
To automatically generate architecture diagrams of your AWS infrastructure, there is a tool called AWS Perspective that will help you perform architectural reviews, detect hidden resources (Shadow IT), and search by resource name tags, resource name, IP, etc. The visualization it generates is exportable in different formats that allow modifications such as draw.io, CSV, JSON, as well as image (PNG).
For additional details on what a Reference Architecture for a secure environment looks like, review the following recommendation: