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