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