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