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