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