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