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