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