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