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