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