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