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