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