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