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