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