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