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