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