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