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