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