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