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