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