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