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