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