The standard grips this chord is usually shown with.
Absus4 is Ab, Db and Eb, a suspended fourth. The shape this page opens on is written 4x1124, lowest string first.

Also written Absus or Ab suspended 4th. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 6 common shapes for Absus4 on the guitar, and 46 derived voicings in the triad family.
In which keys. Every note of Absus4 belongs to C# major (the V), C# minor (the v), Eb minor (the iv), E major (the iii), F minor (the ♭III), F# major (the ii), Ab major (the I), Ab minor (the i), Bb minor (the ♭VII) and B major (the vi).
The common shapes, written lowest string first: 4x1124, xx1124, 466644, xx6899, x-11-11-8-9-x, x-11-13-13-14-11.
Triad. Three notes across one string set. Absus4 has xx112x, xx664x, xxx644, xx6644, 4666xx, x4664x, x6664x, x666xx.
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.