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