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