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