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