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