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)(17,18,22,20)(19,24,26,23)(21,28,29,25)(27,30,32,31)(1,3,6,5)(2,4,7,8)(9,11,13,16)(10,14,12,15)(17,19)(18,23)(20,24)(21,27)(22,26)(25,30)(28,31)(29,32)(2,7)(4,8)(18,20)(19,26)(25,28)(27,32) involution — undirected(1,4,6,8)(2,3,7,5)(9,12,13,10)(11,15,16,14)(17,19)(18,24)(20,23)(21,27)(22,26)(25,31)(28,30)(29,32)(1,5,6,3)(2,8,7,4)(17,20,22,18)(19,23,26,24)(21,28,29,25)(27,30,32,31)(17,21,22,29)(18,25,20,28)(19,27,26,32)(23,30,24,31)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.