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)(12,14)(13,16)(17,18)(19,23)(20,25)(21,24)(22,26)(27,30)(28,32)(29,31) involution — undirected(2,7)(4,5)(8,14)(9,10)(11,12)(15,16)(17,19,22,28)(18,23,26,32)(20,27,21,29)(24,31,25,30)(1,3,6,13)(2,8,10,16)(4,11,5,12)(7,14,9,15)(18,24)(20,21)(23,30)(25,26)(27,29)(31,32)(1,4)(3,11)(5,6)(7,9)(12,13)(14,15)(17,20,22,21)(18,25,26,24)(19,27,28,29)(23,30,32,31)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.