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