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)(11,14)(12,13)(15,16)(17,18,21,24)(19,23,29,32)(20,25,22,26)(27,31,28,30)(2,5)(6,8)(17,19,21,29)(18,23,24,32)(20,28,22,27)(25,30,26,31)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(18,24)(19,27)(20,22)(23,30)(28,29)(31,32)(19,27)(20,22)(23,31)(25,26)(28,29)(30,32) involution — undirected(9,11,12,15)(10,14,13,16)(17,20,21,22)(18,25,24,26)(19,28,29,27)(23,30,32,31)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.