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