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