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)(19,22)(20,27,28,23)(21,24)(25,31,32,29)(26,30)(1,3,5,11)(2,6,7,9)(4,12,13,10)(8,16,15,14)(17,19)(18,22)(20,25)(21,26)(23,29)(24,30)(27,31)(28,32)(17,20,21,28)(18,23,24,27)(19,25,26,32)(22,29,30,31)(19,26)(22,30)(25,32)(29,31) involution — undirectedA 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.