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