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