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