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