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