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