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