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