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