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