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