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