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