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No direct methods are available to set the table border property for native PowerPoint tables. However since the PowerPoint table just special collection of shapes, you can create a simple wrapper to achieve it. This can be extended to apply various border styles.

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' Copyright ©1999-2018 Shyam Pillai. All Rights Reserved.
' ---------------------------------------------------------------------
' You are free to use this code within your own applications, add-ins,
' documents etc but you are expressly forbidden from selling or 
' otherwise distributing this source code without prior consent.
' This includes both posting free demo projects made from this
' code as well as reproducing the code in text or html format.
' ---------------------------------------------------------------------

Option Explicit
Sub HowToUseIt()
Call SetTableBorder(ActivePresentation.Slides(1).Shapes(1).Table)
End Sub

Sub SetTableBorder(oTable As Table)
Dim I As Integer
With oTable
    For I = 1 To .Rows.Count
        With .Rows(I).Cells(1).Borders(ppBorderLeft)
            .ForeColor.RGB = RGB(255, 0, 0)
            .Weight = 5
        End With
        With .Rows(I).Cells(.Rows(I).Cells.Count).Borders(ppBorderRight)
            .ForeColor.RGB = RGB(255, 0, 0)
            .Weight = 5
        End With
    Next I
    For I = 1 To .Columns.Count
        With .Columns(I).Cells(1).Borders(ppBorderTop)
            .ForeColor.RGB = RGB(255, 0, 0)
            .Weight = 5
        End With
        With .Columns(I).Cells(.Columns(I).Cells.Count).Borders(ppBorderBottom)
            .ForeColor.RGB = RGB(255, 0, 0)
            .Weight = 5
        End With
    Next I
End With
End Sub