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