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