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