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