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