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