I love schemaspy for schema visualisations. Look at the sample output they provide, and drool. Note the tabs!
You’ll need to download the JDBC driver here, then your command should look something like:
java -jar schemaspy-6.0.0-rc2.jar -t pgsql -db database_name -host myhost -u username -p password -o ./schemaspy -dp postgresql-9.3-1100.jdbc3.jar -s public -noads
Sometimes using options -port will not working if your database has diferrent port, so you have to add manual port after host parameter, for example:
java -jar schemaspy-6.0.0-rc2.jar -t pgsql -db database_name -host myhost:myport -u username -p password -o ./schemaspy -dp postgresql-9.3-1100.jdbc3.jar -s public -noads
You’ll need to install graphviz as well if you want graphics (apt-get install graphviz for debian based distros).