Have loyalty to your guru. Be fully established in your devotion to him and yet embrace all others with open arms. Give up exclusiveness and be friendly to all. Try to perceive the good in everything. Love of the guru should engender in you love of the whole universe, because you must see him in all. Regarding him as manifest everywhere, serve all creatures with intense love.
The best way in which you can express your real adoration is to actually emulate the gurus example. Live according to the path indicated by him. Have him as your ideal. Strive to build yourself upon that model. This will be the most effective worship of your guru and the most pleasing offering to him.