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