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