Yeah, that is what we now refer to as Dashboard 1.0 (or original / depreciated)
You can add a CSS class name to the switch then use a template with styles to set the style of the button
Template node
toggle node
ui-template styles for full border
<style>
.slim-black-border {
border: 1px solid black;
}
</style>
#### ui-template styles for just the toggle
<style>
.slim-black-border md-switch {
border: 1px solid black;
}
</style>
If you want to dig deeper, read up on CSS
