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