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