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