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