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