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