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