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