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