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