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