One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,10)(4,7)(9,15)(12,13)(14,16)(17,18)(19,23)(20,24)(21,22)(25,31)(26,28)(27,29)(30,32) involution — undirected(1,2,7,15,5,9,4,6)(3,11,10,14,13,8,12,16)(18,22)(23,28)(24,29)(30,31)(1,3)(2,8)(4,12)(5,13)(6,14)(7,10)(9,11)(15,16)(17,19)(18,23)(20,25)(21,26)(22,28)(24,30)(27,32)(29,31) involution — undirected(17,20,21,27)(18,24,22,29)(19,25,26,32)(23,30,28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.