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