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