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