The standard grips this chord is usually shown with.
Eb is Eb, G and Bb, a major triad. The shape this page opens on is written xx1343, lowest string first.

Also written Ebmaj, EbM or Eb major. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 6 common shapes for Eb on the guitar, and 46 derived voicings in the triad family.
In which keys. Every note of Eb belongs to C minor (the ♭III), Eb major (the I), F minor (the ♭VII), G minor (the ♭VI), Ab major (the V) and Bb major (the IV).
The common shapes, written lowest string first: xx1343, x65343, x68886, 11-10-8-8-8-11, x-x-8-8-8-11, 11-13-13-12-11-11.
Triad. Three notes across one string set. Eb has 311xxx, x110xx, 3110xx, 3113xx, xx534x, xxx343, xx5343, xxx046.
The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.