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