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