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