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