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