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