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