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