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