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