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