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