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