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