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