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