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)(19,27)(20,24)(21,25)(22,26)(23,30)(28,31)(29,32) involution — undirected(1,3,6,14,7,4,16,15)(2,8,10,13,12,5,11,9)(17,18)(19,28)(20,24)(21,25)(22,26)(23,29)(27,31)(30,32)(1,4)(2,9)(3,7)(5,11)(6,15)(8,10)(12,13)(14,16)(17,19,22,31)(18,23,26,32)(20,29,21,30)(24,27,25,28)(1,5,6,9,7,8,16,13)(2,4,10,15,12,3,11,14)(17,20,22,21)(18,24,26,25)(19,29,31,30)(23,27,32,28)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.