I'm afraid that the short answer is that you can't, well at least not directly. VBA and VBS are slight variant's and while you could save the code into a .vbs file I very much doubt that it would do anything without changing it to VB Script.
To make a .exe you will need something like Visual Studio. Even then you would probably need to rework your code to make it do it's job.
I guess it depends on what your code does.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
