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