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