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