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