How to display all the arrows for precedent and dependent cells ?

Not traditionally. There are some workarounds though. Either code your own routine to do this, whic *may* look something like this ...

Sub showAllDependents()
    Dim cel As Range, rng As Range
    Set rng = Selection
    For Each cel In rng
        cel.ShowDependents
    Next cel
End Sub

Sub showAllPrecedents()
    Dim cel As Range, rng As Range
    Set rng = Selection
    For Each cel In rng
        cel.ShowPrecedents
    Next cel
End Sub

Sub showNoArrows()
    ActiveSheet.ClearArrows
End Sub

Also, Aaron Blood has a great add-in for doing similar things, it's called Explode, and it's very much worth the download. It is a free add-in. Here is a link: http://www.xl-logic.com/pages/explode.html