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