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)(11,14)(12,13)(15,16)(17,18)(19,25)(20,23)(21,24)(22,27)(26,31)(28,30)(29,32)(1,2)(3,4)(10,13)(14,16)(17,19,21,28,20,27,29,26)(18,22,24,31,23,25,32,30)(2,4)(6,8)(9,11,12,15)(10,14,13,16)(19,26)(21,29)(22,30)(24,32)(25,31)(27,28)(10,13)(14,16)(18,23)(19,27)(24,32)(26,28) involution — undirectedA 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.