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