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