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