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