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