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