CCZE is a robust and modular log colorizer with plugins for apm, exim, fetchmail, httpd, postfix, procmail, squid, syslog, ulogd, vsftpd, xferlog, and more.
For installation
sudo yum install ccze and to use it:
tail -f -n 50 /var/log/firewalld | ccze
#or better yet
cat /var/log/firewalld | ccze|more