One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,9)(4,12)(8,14)(10,11)(13,15)(17,18)(19,23)(20,24)(21,22)(25,31)(26,28)(27,29)(30,32) involution — undirected(1,2,4,6,5,8,12,14)(3,7,10,13,11,16,9,15)(18,22)(23,28)(24,29)(30,31)(1,3)(2,7)(4,10)(5,11)(6,13)(8,16)(9,12)(14,15)(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.