Wilson wanted a just peace, no harsh reparations, and an international body to resolve conflicts peacefully. His ideas were embodied in his '14 Points', which unfortunately he gave to the Germans without consulting his allies.
Clemenceau wanted a very harsh peace, the return of French territories captured in the 1870 war (Alsace and Lorraine), reparations, and the demilitarisation of Germany.
Lloyd-George sort of fell between the two, but domestic politics and the desire for revenge forced him closer to Clemenceau. He also wanted control of German colonies to take away this threat to the British Empire.