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