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