Legal regulations governing digital infrastructures and data spaces, such as the European Health Data Space (EHDS), are becoming increasingly complex and difficult to interpret, particularly for non-experts in law, including citizens and small and medium-sized enterprises. To address this challenge, we propose a method for visualising legal regulations that integrates legal ontology with legal design techniques. The method proceeds through three main stages: an ontology-informed reading of regulatory text supported by large language models (LLMs); the pre-processing of ontological constructs into structured tables enriched with explanations and examples; and the rendering of interactive concept maps using visualisation tools such as Kumu. In order to show the feasibility of the approach, we demonstrate the method using the EHDS as a case. The approach not only supports legal understanding but also contributes to the broader goal of trustworthy digital governance.