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