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