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