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