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