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