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