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