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