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