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