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)(11,13)(12,14)(15,16)(18,23)(19,27)(20,28)(26,31) involution — undirected(2,6)(7,8)(9,11,12,15)(10,13,14,16)(17,18,21,23)(19,25,27,32)(20,29,28,24)(22,31,30,26)(1,3,5,4)(2,7,6,8)(10,14)(13,16)(17,19,21,27)(18,24,23,29)(20,30,28,22)(25,26,32,31)(1,4,5,3)(2,8,6,7)(19,28)(20,27)(22,30)(24,25)(26,31)(29,32)(17,20,21,28)(18,25,23,32)(19,22,27,30)(24,31,29,26)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.