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