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