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)(19,26)(20,24)(21,29)(22,25)(23,27)(28,32)(30,31) involution — undirected(1,2)(3,11)(4,10)(5,7)(6,9)(8,13)(12,15)(14,16)(23,31)(26,32) involution — undirected(1,3,6,12)(2,8,9,16)(4,13,5,14)(7,11,10,15)(17,19)(18,23)(20,27)(21,30)(22,28)(24,32)(25,31)(26,29)(3,12)(8,16)(11,15)(13,14)(17,20,22,21)(18,24,25,29)(19,27,28,30)(23,32,31,26)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.