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