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