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