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