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