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