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