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