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