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