Problem: Instead of showing the variation select field, I would like to show a "Buy" button for each product variation.
Solution: You can use the wpv-woo-buy-or-select shortcode to create multiple Buy buttons. Each button will link to the product detail page, where the user must select a variation to add to their cart.
[wpv-woo-buy-or-select link_to_product_text='Buy Variation 1' show_variation_options='no']
[wpv-woo-buy-or-select link_to_product_text='Buy Variation 2' show_variation_options='no']
[wpv-woo-buy-or-select link_to_product_text='Buy Variation 3' show_variation_options='no']
Or, you can format links that will add a variation directly to the user's cart as described in the link below.
Relevant Documentation:
https://toolset.com/documentation/user-guides/views-shortcodes/#wpv-woo-buy-or-select
http://www.remicorson.com/add-woocommerce-variable-product-with-variations-to-cart/