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