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