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