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