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