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