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