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