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