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