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