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)(17,18)(19,27)(20,25)(21,24)(22,26)(23,28)(29,30)(31,32)(9,11)(10,13)(12,15)(14,16)(17,19,20,30,22,31,21,28)(18,23,24,32,26,29,25,27)(2,5)(6,8)(11,15)(13,16)(17,20,22,21)(18,24,26,25)(19,28,31,30)(23,27,29,32)(11,15)(13,16)(17,18)(19,29)(20,24)(21,25)(22,26)(23,31)(27,30)(28,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,20,22,21)(18,25,26,24)(19,30,31,28)(23,27,29,32)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.