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