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