Warrior Tabi, Breastplate of Valor/Nemean(depending on type), Mystical Mail, Pestilence/Bulwark, Hide of the Urchin/Mantle of Discord, Bulwark of Hope/Pestilence.
If you are a Mana Hungry God, such as Sun Wukong or Fenrir against a Magical, you can get Genji's Guard instead of Bulwark Pestilence first.
Standard Guardian Build:
Shoes of Focus(CDR Boots), Breastplate of Valor, Voidstone, Hide of the Urchin, Mantle of Discord, Bulwark of Hope/Midgardian Mail (depending on the enemy comp)
If you are laning against a Magical, then you should get Voidstone first.
A Special Case for this is Sun Wukong, where you can instead buy Soul Eater into Talismon of Energy and go ham.
Read More