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