You cannot visualize Hashem. Hashem has no guf and the concept of Him is beyond our grasp. Just have in mind the teitch of the words you are davening.
The techeilis of tzitzis is blue which was supposed to remind us of the sky which inspires awe of the power of Hashem. Today it’s hard to see the sky at night, all we see are lights and buildings. Today, all day and night, 24-7, we are surrounded by materialism and immersed in materialism and that’s why it’s a challenge to be inspired by thinking about the greatness of Hashem. We can only think about the power of Hashem through seeing what he has created but we cannot visualize Him.