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