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