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