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)(19,28)(20,30)(21,26)(22,32)(23,27)(24,29)(25,31) involution — undirected(1,3,5,11)(2,6,9,16)(4,12,13,10)(7,15,8,14)(17,19,23,25)(18,24,27,20)(21,29,22,30)(26,31,32,28)(2,7)(4,13)(6,14)(8,9)(10,12)(15,16)(17,20,23,24)(18,25,27,19)(21,31,22,28)(26,29,32,30)(17,21,23,22)(18,26,27,32)(19,29,25,30)(20,28,24,31)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.