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