How could I create a buffer for each set of points (colour group) separately and in one procedure in QGIS 3?
The image below shows a subset of points for buffering.
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In your Attribute Table, you need to create (unless you already have it) a field which will define the unique buffer distance for each of your points.
Then you will be able to accomplish the buffering process by applying
Vector > Geoprocessing Tool > Variable distance buffer
A short practical example based on Airports data from Natural Earth.
In Attribute Table of the Airports layer, I will use an already created attribute "wdid_score" which is an integer type and looks like distance in meters.
Then (after CRS adjustment) I proceeded with Variable distance buffer. See image below.