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