I was interested so I tried the same thing in FlightGear last night. Granted, Laura is just a tropical depression now, but I didn't see much of anything that looked like thunderheads or even precipitation, just basically dark overcast skies
That (apart from the percipitation) is pretty much what a real hurricane looks like - overcast skies, lots of rain (and I mean lots of) and strong, gusty winds. You need to be pretty high (probably at the boundary of space) to see the interesting structure, as the storm systems are pretty huge.
The hurricane is a hot core storm system - all the action happens close to the eye where the air rises and sucks the rest inward. It's not driven by lots of local convection that'd create thunderheads. They might (like Tornadoes) be spawned on the fringes of the storm system.
Basically FG creates what the METAR report says, and if no thunderstorm is reported you won't see it, if no precipitation is reported you won't see it, if overcast skies are reported that;s what you'll get to see, FG has no concept of a hurricane (I've long ago wanted to introduce one into the offline weather system, but never got around to really do it...)