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