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)(11,16)(12,14)(13,15)(17,18,22,26,21,23,30,31)(19,20,28,29,27,24,25,32)(2,5)(3,7)(18,23)(20,24)(26,31)(29,32) involution — undirected(9,11,13,12)(10,14,15,16)(17,19,21,27)(18,24,23,20)(22,28,30,25)(26,32,31,29)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,14,15,16)(19,27)(20,24)(25,28)(29,32)(2,5)(6,8)(17,20,22,29,21,24,30,32)(18,25,26,19,23,28,31,27)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.