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