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