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