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