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