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