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