One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,12)(13,16)(14,15)(17,18)(19,27)(20,30)(21,25)(22,28)(23,24)(26,32)(29,31) involution — undirected(2,5)(6,7)(9,10)(11,12)(13,16)(14,15)(17,19,21,24)(18,23,25,27)(20,28,31,26)(22,30,32,29)(9,11,12,10,14,16,13,15)(17,20,22,23,21,31,32,27)(18,24,26,30,25,19,28,29)(1,3,4,8)(2,6,5,7)(9,12,14,13)(10,11,15,16)(18,25)(20,31)(23,27)(26,28)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.