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