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