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