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