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