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