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