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