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