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