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