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