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