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