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