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)(11,13)(12,14)(15,16)(17,18,21,24)(19,23,26,31)(20,22,28,25)(27,29,32,30)(1,3,4,7)(2,5,6,8)(9,11)(10,13)(12,15)(14,16)(18,22)(19,26)(20,28)(23,30)(24,25)(29,31)(2,6)(5,8)(11,15)(13,16)(17,19)(18,23)(20,27)(21,26)(22,29)(24,31)(25,30)(28,32) involution — undirected(11,15)(13,16)(19,26)(23,31)(27,32)(29,30) involution — undirected(10,14)(13,16)(18,24)(19,26)(22,25)(27,32) involution — undirectedA 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.