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