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