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