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