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