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