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