The only revision tracking sidebars I know about are always black in colour. Showing those sidebars in the PDF should be easy enough if you fiddle with the Revision Tracking display/print options.
If you need these sidebars to be red then you will probably need to find another way of doing that. Perhaps add a frame to set up a border on paragraphs.
Code:
Sub FrameIt()
Dim aFrame As Frame
Set aFrame = ActiveDocument.Frames.Add(Selection.Range)
With aFrame
.TextWrap = False
.Borders(wdBorderRight).LineStyle = wdLineStyleNone
.Borders(wdBorderTop).LineStyle = wdLineStyleNone
.Borders(wdBorderBottom).LineStyle = wdLineStyleNone
.Borders(wdBorderLeft).LineStyle = wdLineStyleSingle
.Borders(wdBorderLeft).LineWidth = wdLineWidth450pt
.Borders(wdBorderLeft).Color = RGB(255, 0, 0)
.Borders.DistanceFromLeft = 20
End With
End Sub