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