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