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