for the Lynx accessible
walmart, the bus stop is right in front of the parking lot's entrance (same sidewalk) when you go, but going back to the hotel, you'll have to cross the 192 to get to the bus stop (pedestrian crossing, but it's the 192 so it's busy ...

)
that's not the Walmart I was talking about.
56 does not come anywhere near that store
you're talking about the somewhat smaller Walmart on Vine Street (still a supercenter).
This one can be reached by Lynx 56, but will cost over $30 one way (taxi)
The walmart I mentionned on Vineland Rd can only be reached by car/bus.
here's a map. (yours has the Google marker, mine has the red arrow and is much closer to WDW but no transportation)