Finish your saltillo patio by sanding, sealing, and grouting.
When the mortar has cured, grind down the edges of the tiles that are thick enough to disturb the smoothness of the surface. (Grind down any edge that would trip someone). Start with a masonry stone and finish the grinding with a sharpening stone (or start with 80-grit carbide sandpaper and work up to a 200 grit). Vacuum the tile, then wipe it with a tack rag to get all the dust up before sealing the tile.
If saltillo is not sealed, it will quickly absorb the moisture from the grout, causing it to crack. Seal the tile twice with a penetrating sealer. If you've purchased presealed tile, seal it once before you grout. Apply the sealer with a brush, roller, or applicator recommended by the manufacturer. Then grout the tile.