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