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