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