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