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