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