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