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