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I did this little workaround:

def g3dPlot(g,colorsDic) :    
    plt=Graphics()
    locationDic=g.get_pos(dim=3)
    for edge in g.edges(sort=True) :

        colorV=colorsDic.get(str([edge[0],edge[1]]))
        vStart=vector(locationDic.get(edge[0]));vEnd=vector(locationDic.get(edge[1]))
        plt+=arrow3d(vStart,vEnd,width=2,radius=0.02,color=colorV )
        posText=(vEnd-vStart)/2 + vStart  + shiftV
        plt+= text3d(edge[2],posText, fontsize='100%', fontweight=50,color=colorV)        
    return plt
gColorPlt=g3dPlot(g,simplex1ColorDic)
gColorPlt=addAxis(gColorPlt,textToPlt,xBound,yBound,zBound,widthA,radiusA)
gColorPlt.show()

sageCell

I did this little workaround:

def g3dPlot(g,colorsDic) :    
    plt=Graphics()
    locationDic=g.get_pos(dim=3)
    for edge in g.edges(sort=True) :

        colorV=colorsDic.get(str([edge[0],edge[1]]))
        vStart=vector(locationDic.get(edge[0]));vEnd=vector(locationDic.get(edge[1]))
        plt+=arrow3d(vStart,vEnd,width=2,radius=0.02,color=colorV )
        posText=(vEnd-vStart)/2 + vStart  + shiftV
        plt+= text3d(edge[2],posText, fontsize='100%', fontweight=50,color=colorV)        
    return plt
gColorPlt=g3dPlot(g,simplex1ColorDic)
gColorPlt=addAxis(gColorPlt,textToPlt,xBound,yBound,zBound,widthA,radiusA)
gColorPlt.show()

sageCell