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