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