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