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