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