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