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