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