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