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