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