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