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