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