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