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