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