Here’s my solution (it’s the one from the book):
And here’s the link:
http://www.lodev.org/jstumble/?board=1bglllbr1l0eelxllerlr1eelerlereexeelelrerelelelleree
Description: I bet there’s a better way to do it. 
I haven’t looked at Samuel’s 27-part version yet, but here’s a slight streamlining of yours, just combining a couple of paths:
https://www.lodev.org/jstumble/?board=1bglllbr1l0eerxlleelr1eelerlereexeerelreerleleeleree_8_8
(Here again, my original version was much more complicated; I came up with this version only after looking at your solution. So it’s just a slight streamlining of yours, not really mine.)
And further:
https://lodev.org/jstumble/?board=1bgr1lberx0frr1frrlfrxfelrfleleelereeleele_8_8
(I think my solution is original, but I may have seen the book solution a while back)