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