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)(17,18,21,20)(19,25,26,32)(22,30,27,24)(23,31,28,29)(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(18,20)(19,26)(24,30)(29,31) involution — undirected(1,3,5,4)(2,7,6,8)(11,15)(13,16)(17,19,27,31,21,26,22,29)(18,23,30,32,20,28,24,25)(11,15)(13,16)(17,20,21,18)(19,28,26,23)(22,30,27,24)(25,29,32,31)(1,4,5,3)(2,8,6,7)(10,14)(13,16)(18,20)(19,26)(24,30)(29,31)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.